/// 描述边角的大小
/// 默认情况下，顺序从右下开始，按顺时针排序
class CornerSize {
  final double topRight;
  final double topLeft;
  final double bottomLeft;
  final double bottomRight;
  CornerSize(
    this.bottomRight,
    this.bottomLeft,
    this.topLeft,
    this.topRight,
  );
  CornerSize.all(double size)
      : topRight = size,
        topLeft = size,
        bottomLeft = size,
        bottomRight = size;
}
